No causal link between changes in hand position sense and feeling of limb ownership in the rubber hand illusion.
No causal link between changes in hand position sense and feeling of limb ownership in the rubber hand illusion.
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DOI：
10.3758/s13414-015-1016-0
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发表时间：
2016-02
期刊：
影响因子：
--
通讯作者：
Ehrsson HH
中科院分区：
文献类型：
--
作者：
Abdulkarim Z;Ehrsson HH
橡胶手错觉（英语：Rubber hand illusion）是一种知觉错觉，参与者将一只无生命的橡胶手体验为属于自己的身体。这种错觉是通过同时抚摸橡胶手和参与者的真实的手（隐藏在视线之外）而引起的。拥有橡胶手的感觉伴随着手位置感（本体感觉）的变化，因此当参与者被要求指出他们（看不见的）手的位置时，他们表示它位于更靠近橡胶手的位置。这种“本体感受漂移”是橡胶手错觉最广泛使用的客观测量方法，从理论的角度来看，它表明本体感受和身体所有权感之间存在密切联系。然而，手的位置感的变化和肢体所有权的变化之间是否存在因果关系的关键问题是未知的。在这里，我们通过设计一个新颖的设置来解决这个问题，该设置允许我们在不引起参与者注意的情况下机械地操纵参与者的手的位置，同时引发橡胶手错觉。我们的研究结果表明，改变感觉到的位置接近或远离橡胶手没有改变橡胶手错觉的强度。因此，错觉不依赖于手的位置感的变化。这一发现支持身体所有权和中心身体表征的模型，认为本体感受漂移和主观错觉与不同的中枢过程有关。
The rubber hand illusion is a perceptual illusion in which participants experience an inanimate rubber hand as belonging to their own body. The illusion is elicited by synchronously stroking the rubber hand and the participant’s real hand, which is hidden from sight. The feeling of owning the rubber hand is accompanied by changes in hand position sense (proprioception), so that when participants are asked to indicate the location of their (unseen) hand, they indicate that it is located closer to the rubber hand. This “proprioceptive drift” is the most widely used objective measure of the rubber hand illusion, and from a theoretical perspective, it suggests a close link between proprioception and the feeling of body ownership. However, the critical question of whether a causal relationship exists between changes in hand position sense and changes in limb ownership is unknown. Here we addressed this question by devising a novel setup that allowed us to mechanically manipulate the position of the participant’s hand without the participant noticing, while the rubber hand illusion was being elicited. Our results showed that changing the sensed position closer to or farther away from the rubber hand did not change the strength of the rubber hand illusion. Thus, the illusion is not dependent on changes in hand position sense. This finding supports models of body ownership and central body representation that hold that proprioceptive drift and the subjective illusion are related to different central processes.